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How can I install a new flow protector?

Good power to unit. When calling for hot water, the unit doesn't turn on--I have to physically take a hammer and tap on the cold water inlet pipe and then the unit turns ON.

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There is power to the system but when you turn water on elements do not come one and heat water. all phases have 238 volts to them. why will system not turn on and heat water


Do you have 3-phase water heater? Is this balanced or unbalanced 3-phase unit. Add comment and describe product in detail, including brand since i have some service resources for both types.
Or do you have ordinary residential split-phase 240Volt Bosch tankless computer that heats water, and has 2 or 3 separate elements, and a separate circuit breaker supplying power to each element? And testing across both hot leads coming from each breaker yields 238Volt?
Copy following link for Bosch tankless manuals, with brief troubleshoot section that does not provide detailed service procedures for repairing tankless computer:
http://waterheatertimer.org/How-to-wire-Tankless-electric-water-heater.html#manual
If this is new water heater, then call installer. If you installed yourself, then remove tankless and return to seller for refund.
Tankless computers require certain amount of water flow to activate computer sensors. Turn on Hot tap and listen to pipe to hear if water if flowing through hot pipe. Check for crossover:
http://waterheatertimer.org/Crossover.html
Clean water filter usually located just above where cold water connects to unit.
Delime tankless ... and use water softener. Tankless cannot be exposed to more than 11 grains hardness in water, or parts will fail within 2-3 years. Simply deliming tankless heat exchanger each year will not maintain full efficiency... although for typical family of 4, tankless comper water heater costs $100 more to operate than tank-type heater according to manufacturer's promo literature and independent studies.
Call local technician who specializes in fixing tankless computers. For plumbing problems call local plumber. These are two different things.
If tankless computer is older, then cut losses, and buy tank-type electric water heater at Lowes for $285 and make quick changeover and have hot water same day. Sell old tankless on ebay and cheat next guy, or sell at scrapyard for $3 per 100.
Gene
h

Aug 05, 2013 | Bosch PowerStar AE125 AE125 Whole House...

1 Answer

Noisy water pipes when neighbours use water


Install air chamber to cushion sudden-stop of flowing water.
Water flow coming to sudden stop is called water hammer, and will bang pipes, but also loosen plumbing joints, causing leaks.
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html#bang
http://waterheatertimer.org/images/Flow-rates-water-hammer-600.jpg

Air chamber has to be vertical, and about 18" long, with cap on top.
By code each Hot and Cold line at each tap will have air chamber located behind the wall. So there are two air chambers at each tap.

In your case, you can probably add air chamber to your Hot and Cold lines and solve problem for both dwellings.

Water hammer is caused because water does not compress like air.
So when long column of water suddenly stops... the whole pipe-full of water comes to sudden halt... and that water could weigh 1-1/2 pounds ... and just like a hammer head moving, the weight of water bangs the pipes to dissipate energy, causing noise.

Apr 21, 2013 | Water Heaters

1 Answer

I've got the Bosch AE 9.5 tankless water heater.


1) Cheapest and most reliable solution: Install tank-type electric water heater from local box store for $250. Get store coupons, offer 10% off store price. Repairs are made same day with generic off-the-shelf parts.
http://waterheatertimer.org/pdf/How-to-install-electric-water-heater.pdf

2) Install grundfo water pressure boosting pump.
http://www.ronhazelton.com/projects/how_to_increase_water_pressure_in_your_home
http://waterheatertimer.org/How-to-solder-pipes.html

3) Remove areators and low flow shower heads, Maintain unit as shown in product manual: Delime tankless unit yearly, Clean water filter monthly.

4) Call city and report low pressure and report issue as fire hazard, move to different apartment. Call apartment complex and ask why they didn't read flow requirements for tankless before installing tankless.

5) Call Bosch 866-330-2729 and complain that nobody read the flow requirement or tested local water flow before installing tankless.

Dec 30, 2012 | Water Heaters

1 Answer

Our rheem pronto tankless rutg-74xp red light will come home indicating hot water and stay on about 2 minutes and then turns off we have turned off and back on and let water run for 5 minutes and will come...


Before calling service technician, open following link for Rheem troubleshooting resources.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

List of causes MIGHT include one of following:
Bad household circuit breaker that powers electronics, or loose wire inside outlet where tankless plugs in.
Tankless fuses and control board.
Water flow rate too low. Minimum .8 gallon required (depending on model)
Tankless inlet filter clogged.
Household aerators clogged at faucets.
Crossover at single-handled faucet
If installed, there can be crossover at mixing valve.
Faulty household check valve, including check valve on re-circulation system if that system is installed.
Restriction in household water line, such as clog at elbow.
Unequal pressure in household hot and cold lines, caused by restriction in hot line. When single-handled faucet turns on, the cold water pressure is higher so hot does not flow and tankless will not turn on.
Loose wire connection inside tankless.
Unit temperature set too high.
Unit temperature set too low.
Water temperature is very hot coming out of tap, so more cold is added, but that reduces amount of hot water flow, so tankless turns off because flow rate is too low.
On some tankless, if water is preheated by solar or other indirect source, the burner will not activate.
High mineral content in water > delime tankless yearly
Misaligned temperature sensor
Low gas pressure. Wrong type of gas. Undersized gas line.
Too many faucets on at same time.
Faulty tankless water valve. Water valve stuck.
Fluctuating household water pressure, for example MUD and PUD district water pressure problems or water well pressure.
Faulty household pressure reducing/regulating valve if installed.
Faulty household pressure tank, if installed -or- pressure tank needs to be installed.

Apr 24, 2011 | Rheem RTG-74PVN-2 Natural Gas Pronto Whole...

1 Answer

Rinnai R50LSi water heater- Water doesn't heat.


Flow meters can get jammed by silt or debrise. The only way that I know to check this problem it to remove & inspect the part and that takes alot of training if you have a Rinnai (not recommended for the beginner).

One thing you could check is the inlet screen. Turn off the water and power to the unit and drain down. The screen in the black plastic circle on the inlet fitting under the unit. Unscrew this and check how much grit it has collected. Clean off, replace, turn water back on, open a hot faucet to get the air out then turn the power back on. This sometimes improves the flow enough to solve the problem.

Apr 16, 2010 | Rinnai Water Heaters

2 Answers

After water to house was shut off, my Noritz tankless water heater is on but won't produce hot water. On the unit, the light indicating that the burner is on stays off now.


you probably had debris get into the filter or flow sensor when the water was turned back on. I'd recommend checking the filter first and if that doesn't work, call Noritz Tech support to help you with the flow sensor.

the filter is a black plug located on the cold water line (labeled cold on the bottom of the unit). It points torwards the left.

Apr 14, 2010 | Noritz 7.1 Gpm Natural Ng Gas Tankless Hot...

1 Answer

No hot water from bosch tankless heater


  1. If the display is blank, verify power to electrical outlet. (120VAC/60Hz properly grounded circuit required). Verify that the heater on/off switch is in the on (I) position.
  2. Verify the fuses in the control unit are good.To access fuses, the control unit must be removed. See BULLETIN TWH-G2-24 Two spare fuses are located inside lower access panel of control unit.
  3. Make sure cold water inlet connection is plumbed to the right side of heater when facing unit.
  4. A minimum of 0.8 gallons per minute (GPM) (3 l/m) is required to activate the heater. A quart container should fill in 20 seconds or less to activate heater.
  5. Clean inlet filter screen per chapter 5.2. of the installation manual.
  6. Inspect the water path for obstructions. Make sure all showerheads, faucet aerators and whole house filters are clear of debris.
  7. The heater activates when the water flow through the unit is at or above the required minimum of 0.8 GPM (3 l/m). A crossover creates back pressure on the water flowing through the heater. Therefore, a higher flow rate than normal is needed to force the heater to activate. To check for a plumbing crossover, shut off the cold water supply feed to the water heater. Then open all of the hot water taps served by the heater. Wait 10 minutes and check for water flow at taps. There should be no water flowing. Any continuous flow of water indicates a crossover is present and must be corrected. Consult a professional plumber for help in correcting a crossover. Failing single lever faucets and mixing valves are common causes of plumbing crossovers.
  8. With the ON/OFF switch turned to OFF (O) position and the power supply cord unplugged, remove theunit's front cover (See Page 5. Fig 3 of installation manual). Check wire connections between the water valve, control unit and electrode set. See chapter 9.2 of installation manual for location of these parts.

Feb 14, 2010 | Bosch & Tankless LP Hot Water Heater

6 Answers

I have a Rinnai model 2532 Tankless Water heater. When the Bath water is turned on (which is the largest water flow for the water heater)it makes a loud vibrating sound that can be heard through the entire...


We had the same problem - the hot water would only be hot for 3 -5 minutes and shut off, then we had to turn the water off, wait a few minutes, and do it again. VERY FRUSTRATING.

Soution: The Rinnai serviceman showed me the heat-exchanger blower/fan: It was clogged with dust and moths.

Another clue: Our Rinnai was extremely noisy when the heat came on. After the fan was cleaned and replaced, it is nearly silent.

If you are reasonably mechanically inclined:
TURN THE BREAKER / POWER OFF to the unit.

The blower-fan is located in the lower central area of the unit (at least on our unit). If you draw imaginary north-south, east-west lines through the center of the unit, the fan is in the lower-left quadrant. There is a spring clamp securing the black rubber accordian-like tube to the fan. There are two screws that secure the fan to the unit. there are two plugs that connect to the fan, as well as a third air-flow sensor that should be removed. then you can look at the fan unit, as well as the grill on the underside of the heat-exchanger that should be cleaned.

My thought was to go out and get a simple bug-screen, and place it over the air-input outlet vent going outside, but the repair guy said that although it may sound good, if that screen ever gets clogged, or reduces airflow to the Rinnai, then the unit will work harder, or even shut off, giving the same problem. Also - the Rinnai pipe going outside is a pipe within a pipe - so its both inlet and outlet air.

Nov 19, 2009 | Rinnai Webstone The isolator EXP tankless...

1 Answer

No hot water after installation and powering up


All water valves open? Unit will flow approx 3/4 gallon prior to starting. If flow is good, check the flow switch to see if it is closing. If flow switch is closing and unit still not firing, assuming gas pressure is good; Nat 3.5''w.c., LP 10" w.c., loose wiring at board, ignitor. Sounds like something simple overlooked.

Jul 12, 2009 | Rheem Tankless Hot Water Heater...

2 Answers

PowerStar AE125 seems to have failed


You have a blown element. If you purchased the heater, call Bosch for technical assistance, and the unit should be under warranty. The grey matter your getting is the magnesium that the elements have in them.

Nov 12, 2008 | Bosch PowerStar AE125 AE125 Whole House...

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